JPS6242811Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a heating device for a vehicle such as an automobile that utilizes exhaust heat.

[Conventional technology]

Conventionally, as described in the above-mentioned vehicle heating system, a heat exchanger installed in the engine exhaust system heats a part of the engine cooling water when necessary, as shown in Japanese Utility Model Application Publication No. 53-87554. Then, the heated cooling water is passed through a heater equipped with a heater blower by opening the heater pot, and the air that has been heat exchanged with this heater is sent into the passenger compartment by the heater blower to heat the vehicle.The cooling water that comes out of the heater joins the return water from the radiator. It is known that the engine is fed back to the engine.

[Problem that the invention attempts to solve]

However, with the conventional vehicle heating system described above, it takes a long time to warm up the vehicle engine,
There are problems with heating control, such as the heating start-up time being long. The object of the present invention is to solve the problems of the conventional systems described above, and to provide a highly reliable vehicle heating system that has short warm-up time and heating start-up time, does not cause overheating.

[Means to solve the problem]

This invention is a vehicle that has a heater flow path in which a heater with a heater blower is connected via a heater cock to a heat exchanger that heats engine cooling water with exhaust heat, and the downstream side of this heater is connected to a return flow path from a radiator. In the heating system, the radiator is provided with a high temperature switch that turns on when the temperature of the cooling water exceeds a predetermined temperature, opens a normally closed relay contact, and turns off a solenoid valve that operates the heat exchanger. A low-temperature switch is provided on the engine side that turns off the solenoid valve when the relay contact is closed, and a temperature control lever operated from the driver's seat is used to link the switch with the opening and closing of the kettle, which is manually operated. A low-temperature switch is connected in parallel to the low-temperature switch, and heating is performed when the low-temperature switch is on and the high-temperature switch is off.

[Effect]

The vehicle heating system of the present invention is configured as described above, and when the cooling water is at a predetermined temperature or higher, the high temperature switch is turned on and the relay contact opens, which turns off the solenoid valve and closes it. The heat exchanger will not operate regardless of the condition, preventing the engine from overheating. Furthermore, with the device of the present invention, when the high temperature switch is off and the low temperature switch is on, the engine can be warmed up regardless of the season, and the warm-up time can be shortened. Furthermore, since the temperature control lever allows the control switch to be operated at any position, the temperature setting for operating and non-operating the heat exchanger can be easily changed.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes an engine mounted on an automobile, and an outgoing cooling water passage 3 is connected to the cooling water passage of the engine 1 via a thermostat 2, and the outgoing passage 3 has a radiator fan 4. It is connected to a radiator 5, and the radiator 5 is connected to a cooling water passage of the engine 1 through a cooling water recirculation passage 6. One end of a heater flow path 7 is connected to the cooling water path of the engine 1, and this flow path 7 is connected to a front heater 12 with a heater blower 11 via a heat exchanger 8 using exhaust heat, a rear heater 9, and a heater cooker 10. The downstream side of this heater 12 is connected to the cooling water recirculation path 6, and the heat exchanger 8 and rear heater 9
It is also connected to the reflux path 6 through a bypass flow path 13. In the heat exchanger 8, a pipe line 16 that bypasses a part of the exhaust pipe 15 between the engine 1 and the muffler 14 is inserted, and a gas switching valve 1 is inserted into the inlet of the pipe line 16.
7 is provided, and this switching valve 17 is configured to be switched and controlled by an actuator 20 connected to an intake manifold 18 by a vacuum pipe 19, and a solenoid valve 21 is interposed in the vacuum pipe 19. There is. In FIG. 1, reference numeral 22 is a water pump, 23 is a cooling water inlet, 24 is an air vent pipe, and 25 is a reserve tank. Also, a high temperature switch 26 is installed in the radiator 5, and a low temperature switch 27 is installed in the cooling water outlet section of the engine 1.
are provided for each. As shown in FIG. 2, the electric circuit includes a battery 28 and a key switch 31.
The motor 29 of the radiator fan 4, the normally closed contact 30a and the coil 30b of the relay 30 are connected in parallel, and the high temperature switch 26 is provided in series with the motor 29, and the coil 30b of the relay 30 is connected between them. and the contact 30a of the relay 30
A coil 21a of a solenoid valve 21 and a low temperature switch 27 are provided in series with the solenoid valve 21. A pot switch 32 is connected between the coil 21a and the low temperature switch 27, and this switch 32 is manually operated in conjunction with opening and closing of the heater pot 10. That is, as shown in FIG. 3, by operating the temperature control lever 33 provided on the instrument panel of the automobile from the driver's seat, the heater cock 1 is controlled via the cable 34.
0 is opened and closed, and in conjunction with this, the force contact 32 of the switch 32 provided on the cable 34
a comes into contact with and separates from the fixed contact 32b, and the switch 3
2 is turned on and off. Although not shown, a blower switch for operating the heater blower 11 is provided in the instrument panel of the automobile so as to be turned on and off by an electric circuit different from the electric circuit shown in FIG. Next, the operation of the embodiment configured as above will be explained. The high temperature switch 26 of this embodiment is set to be turned on at 92°C or higher, and the low temperature switch 26 is set to be turned off at 60°C or higher. When the high temperature switch 26 is turned on, the coil 30b of the normally closed relay 30 is energized and its contact 30a is opened, so the coil 21a of the solenoid valve 21 is not energized regardless of whether the other switches are on or off. 8
is not operating, that is, it is off, and therefore does not perform heating operation. When the high temperature switch 26 is turned off, the current to the coil 30b of the relay 30 is cut off, so the contact 30
a closes. In this state, when the heating switch 32 is turned on, heating is normally performed regardless of whether the low temperature switch 27 is turned on or off. That is, the solenoid valve 21 is opened by energizing the coil 21a, the suction negative pressure acts on the actuator 20 via the vacuum pipe 19, the gas switching valve 17 is opened by this operation, and the exhaust gas is transferred to the heat exchanger 8. The coolant flowing through the heater flow path 7 is heated by the operation of the water pump 22, and the heated coolant enters the front heater 12 via the rear heater 9 and the heater tank 10.
Here, heating air is heated by the operation of the heater blower 11 and sent into the vehicle interior, thereby performing heating. In this case, the heated cooling water also enters the rear heater 9, so heating is performed by this as well, but the rear heater 9 can be omitted. The cooling water exiting the front heater 12 enters the recirculation passage 6 and returns to the cooling water passage of the engine 1 together with the cooling water cooled by the radiator 5. Also, the intake negative pressure of the engine 1 is lower than the predetermined value.
When approaching , the actuator 20 is deactivated, the gas switching valve 17 is closed, and the exhaust gas no longer flows into the pipe 16 inserted into the heat exchanger 8, so the heat exchanger 8 is no longer activated, that is, it is turned off, and the engine is turned off. 1. It is possible to prevent the output from decreasing during high loads. In addition,
As with conventional heating devices of this type, the heating temperature can be adjusted by operating the temperature control lever. Then, when the heating switch 32 is stopped, the heating stops, and when the low temperature switch 27 is turned on, warm-up operation is possible, and when the low temperature switch 27 is turned off, the warm-up operation is completed, and the solenoid valve 21 is closed, so heat exchange is possible. The device 8 becomes inactive. Note that when the low temperature switch 27 is turned off, a low temperature switch (not shown) is also turned off. The control of the heating device of this embodiment described above is as shown in the following table.

[Table] Basic idea Overheat prevention To prevent overheating of the cooling system, when the high temperature switch 26 is on, the heat exchanger 8 is turned off in priority over other switches. Normal heating operates when the heating switch 32 is turned on. Warm up: Turn on the heat exchanger 8 when the low temperature switch 27 is on. Warm-up completed When the low temperature switch 27 is off, turn off the heat exchanger. As explained above, according to this embodiment, the gas switching valve 17 is opened and closed using suction negative pressure as described above, and the solenoid valve 21 is provided in the vacuum pipe 19. Even when opened, exhaust gas can be prevented from entering the heat exchanger 8 when the load is higher than the set value, and a reduction in engine power performance can be prevented. It is also possible to simplify the structure by directly providing the solenoid valve 21.

[Effect of the idea]

As explained above, the vehicle heating system of the present invention uses exhaust heat to heat the engine cooling water and uses it as a heat source for heating, so it has good heating performance, powerful heating, and good defrosting performance. In particular, by using the high-temperature switch, relay, low-temperature switch, low-temperature switch, low-temperature switch, and solenoid valve, and arranging and configuring them as described above, the heat exchanger is less likely to malfunction when it is on, and overheating can be reliably prevented. Reliability can be improved, warm-up operation can be performed regardless of the season, and the warm-up time can be shortened.Furthermore, the heat exchanger switch is linked to the opening and closing of the heater cooker using a temperature control lever. The effect is that the temperature setting for operating and non-operating the device can be easily set.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a vehicle heating system according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram of the same, and FIG. 3 is an explanatory diagram of the vicinity of a small switch. 1...Engine, 2...Thermostat, 3...
...Cooling water forward flow path, 4...Radiator fan, 5
...Radiator, 6...Cooling water recirculation path, 7...
Heater flow path, 8... Heat exchanger, 9... Rear heater, 10... Heater cock, 11... Heater blower, 12... Front heater, 13... Bypass flow path, 14... Silencer, 15... Exhaust Tube, 16...
... Pipe line, 17 ... Gas switching valve, 18 ... Intake manifold, 19 ... Vacuum pipe, 20 ...
...actuator, 21 ... solenoid valve,
21a...Coil, 22...Water pump, 2
3... Water inlet, 24... Air vent pipe, 25... Reserve tank, 26... High temperature switch, 27...
Low temperature switch, 28...Battery, 29...Motor, 30...Relay, 30a...Normally closed contact, 30
b...Coil, 31...Key switch, 32...
Kotuku switch, 32a...Movable contact, 32b...
... Fixed contact, 33 ... Temperature adjustment lever, 34 ...
cable.

Claims (1)

[Scope of utility model registration request] In a vehicle heating system that has a heater flow path in which a heater with a heater blower is connected via a heater cock to a heat exchanger that heats engine cooling water with exhaust heat, and the downstream side of the heater is connected to a return flow path from a radiator. , a high temperature switch is provided in the radiator to turn off a solenoid valve that turns on when the temperature of the cooling water exceeds a predetermined temperature, opens a normally closed relay contact, and operates the heat exchanger, and turns off when the temperature of the cooling water exceeds a predetermined temperature, opening the relay contact. A low-temperature switch that turns off the solenoid valve when the solenoid valve is closed is provided on the engine side, and a low-temperature switch that is linked to the opening and closing of the solenoid valve by a temperature control lever operated from the driver's seat is connected in parallel to the low-temperature switch, so that the low-temperature switch is turned on. A heating device for a vehicle, characterized in that heating is performed when a high temperature switch is turned off.